do not use _Noreturn for a function pointer in dynamic linker

_Noreturn is a C11 construct, and may only be used at the site of a
function definition.

src/internal/dynlink.h

@@ -95,7 +95,7 @@ struct fdpic_dummy_loadmap {
 #define DYN_CNT 32
 
 typedef void (*stage2_func)(unsigned char *, size_t *);
-typedef _Noreturn void (*stage3_func)(size_t *);
+typedef void (*stage3_func)(size_t *);
 
 hidden void *__dlsym(void *restrict, const char *restrict, void *restrict);